Klein Tools ET450 Circuit Tracer Kit — Wire & Breaker Finder

GRADE: A — Like New. Tested and fully working with minor signs of use. All accessories present including carrying case, leads, prongs, and manual; no cosmetic wear observed on transmitter, receiver, or accessories.

Condition: Like New. Tested and fully working with minor signs of use. All accessories present including carrying case, leads, prongs, and manual; no cosmetic wear observed on transmitter, receiver, or accessories.

The Klein Tools ET450 Advanced Circuit Tracer Kit is a professional-grade tool. It locates energized and non-energized breakers, fuses, and wires with precision. Electricians and contractors rely on this tracer daily. The kit ships with every accessory needed for immediate deployment on the job site. This is the complete ET450 set at a significant savings over MSRP.

The ET450T transmitter is the heart of this circuit tracer system. It sends a detectable signal along the target wire or breaker. Onboard voltage indicators display five levels: 12V, 48V, 120V, 240V, and 480V. Separate DC and AC indicator lights show power type at a glance. The transmitter's "Transmitting" status light confirms active signal output. A rugged orange-and-black housing provides excellent grip in the field. The transmitter connects via blade prongs, ground prongs, or alligator clips. An AC plug lead allows direct outlet connection for fast breaker identification. The 20-foot lead adapter extends range for underground or remote tracing. All prong adapters shown in photos are present and undamaged.

The ET450R receiver picks up the transmitted signal along the wire path. Its large LCD screen displays signal strength in real time. Up and down arrow buttons allow the user to adjust sensitivity levels. Adjustable sensitivity lets this tracer penetrate drywall, cement block, and shielded cable. Underground wire tracing is supported with the correct sensitivity setting. An audible beep increases in frequency as the receiver nears the target wire. Visual bar indicators on the display back up the audible signal. The receiver's NCV (non-contact voltage) button detects live wires without contact. A built-in flashlight illuminates dark panel boxes and crawl spaces. The ET450R is rated CAT III 600V for safe use on high-voltage systems.

This circuit tracer kit handles a wide range of electrical tracing tasks. Trace a single wire within a bundle without disturbing others. Identify a specific breaker in a crowded panel in seconds. Locate conduit or pipes running behind finished walls. Trace underground wiring with the included 20-foot lead adapter. The transmitter's multi-voltage display removes guesswork on unfamiliar systems. Both AC and DC circuits can be identified from a single transmitter platform. This versatility makes the ET450 a standout in any electrician's tool bag. Facility managers and maintenance crews benefit equally from this tracer's capabilities.

Klein Tools has manufactured professional electrical tools since 1857. The brand is trusted by licensed electricians across North America. The ET450 is ETL-listed and carries CE and UKCA certifications. It meets CAT III 600V safety standards for use in demanding environments. The hard-shell carrying case keeps all components organized and protected. Photos confirm the case exterior is clean and latches operate correctly. The instruction manual is included and shows no damage or missing pages. Batteries are included with the kit as originally configured. This is a tested, field-ready tracer kit available at a below-retail price.

The transmitter and receiver housings show no scratches, cracks, or worn markings. Buttons on both units actuate with a positive, crisp click. The LCD on the receiver powers on and displays a clear, readable screen. All lead connections seat firmly with no looseness or corrosion. Red and black alligator clips are fully functional and spring-loaded correctly. The 3-foot and 20-foot leads are free of kinks or insulation damage. Blade prongs and ground prongs are clean and free of oxidation. The AC plug lead inserts cleanly into standard 120V outlets.

Learn more about circuit tracing principles and electrical safety on the Wikipedia page for Electrical Wiring. For more professional-grade electrical diagnostic tools, Explore our Tools Collection.

Frequently Asked Questions

Question 1: Can this kit trace non-energized wires and breakers, or only live circuits?

Answer 1: The Klein Tools ET450 is specifically designed to trace both energized and non-energized circuits. When a wire is de-energized, the transmitter injects its own signal into the circuit through the alligator clips or prong adapters. The receiver then follows that injected signal to the correct breaker or wire endpoint. This dual capability makes the ET450 suitable for new construction wiring as well as live panel troubleshooting.

Question 2: How does the adjustable sensitivity feature help during tracing?

Answer 2: Adjustable sensitivity allows the receiver to filter out interference from nearby wires. In dense wire bundles, lowering sensitivity helps isolate a single target wire. In underground or through-wall applications, raising sensitivity improves detection range. The receiver's up and down buttons provide fine-grained control during the trace process. This flexibility reduces false readings and dramatically speeds up accurate wire identification on complex jobs.

Question 3: What voltage levels can the ET450T transmitter detect and display?

Answer 3: The ET450T transmitter features five external voltage indicator levels clearly labeled on its face. These levels are 12V, 48V, 120V, 240V, and 480V. Separate DC and AC indicator lights clarify the type of current present. When both DC and AC indicators illuminate simultaneously, the circuit is confirmed as AC. This multi-level voltage display eliminates the need for a separate voltage tester in most common residential and commercial tracing scenarios.

Question 4: What is included in this kit, and is everything present?

Answer 4: This listing includes the complete ET450 kit as originally configured by Klein Tools. The ET450T transmitter, ET450R receiver, alligator clip leads, 3-foot lead adapter, 20-foot lead adapter, AC plug lead, blade prongs, ground prongs, batteries, instruction manual, and hard-shell carrying case are all present. Every component has been visually inspected and confirmed present. The unit has been tested and confirmed fully functional prior to listing.

Question 5: Is the NCV function on the receiver safe to use on high-voltage panels?

Answer 5: The ET450R receiver is rated CAT III 600V, meeting internationally recognized safety standards for test equipment used on distribution-level electrical systems. The NCV (non-contact voltage) function detects live voltage without requiring physical contact with the conductor. This design reduces exposure risk during panel inspections. Users should always follow the safety warnings in the included instruction manual and applicable local electrical codes when working near energized equipment.

The Klein Tools ET450 circuit tracer is a smart investment for any working electrician. Tracing a wire through a finished wall no longer requires destructive exploratory cuts. The breaker finder function eliminates the trial-and-error method of flipping breakers one at a time. Underground wire detection capability extends the tool's utility to outdoor and landscape electrical systems. Professionals in residential, commercial, and light industrial settings all benefit from this tracer kit.

Buying this tested, like-new ET450 means getting a premium circuit tracer at a fraction of the original retail price. Klein Tools backs its products with a well-established reputation for durability and accuracy. This particular kit has been inspected, tested, and confirmed to perform to specification. The hard carrying case ensures every component stays organized between jobs. Add this Klein Tools wire and breaker tracer to your kit today and eliminate electrical guesswork on every future job.

Urban Supply Plus · Every item professionally inspected & graded · SKU LPNPMUU4302914